Sal Khan, the founder and CEO of Khan Academy, built an education enterprise on virtual learning. But as many communities across the country prepare to start the fall with online-only instruction, even he admits that distance learning is a less than perfect substitute for in-person schooling.
The former hedge fund analyst first hatched the idea for Khan Academy as a way to tutor his younger cousins in math. Since its launch in 2008, the site has been providing free video tutorials and lectures. Today, it serves more than 100 million users worldwide.